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I will try to answer it as far as my knowledge in structural engineer goes: There are to main types of forces (besides winds, laterals, etc) that actuate in a bridge: tensile strenght and yield strenght. The first has to do with how much weight can a material handle by "squeezing" it, before it breaks. The second has to do with how much you can stretch a material before it deforms, and go back to its original shape. Basically how elastic a material is. Steel is extremely elastic and also can offer a high tensile strenght. Concrete offers tensile strenght but is not too elastic (unless it has rebaring inside). That's why most bridges are made of steel. A plastic material (oppose to elastic) would deform and won't go back to it's original shape. Hope it helps.
What else can I help you with?
What is the strongest material used for building bridges?
Steel
When was Building Bridges created?
Building Bridges was created in 1984.
What are the most common materials used in bridges?
The most common materials used in bridge building are generally steel or concrete for larger bridges, and stone or wood for smaller bridges.
What common materials are commonly used for building bridges?
Steel and concrete.
What hard rock is used for building bridges and buildings?
limestone
What are the release dates for Building Bridges - 2014?
Building Bridges - 2014 was released on: USA: 2014
What hard rock is useful in building bridges and building?
Most modern bridges are steel structure or framework. Limestone, dolomite and marble have been used in many historic buildings attesting to their durability.
What are cable stayed bridges made of?
The primary building materials in cable-stayed bridges are steel, which is used in the cables and also as the reinforcing material in the concrete, which is the other primary building material.
How is geometry used in building bridges?
I dont know i need the same answer buddy!
Watertight chamber used for repairing a ship or building bridges beneath the waterline?
Cofferdam
Which building material that is used today was invented to build large buildings and bridges in ancient Rome?
The Romans used the arch to build large buildings and bridges.
Why bridges are made of concrete not plastics?
Concrete is a jillion time cheaper than plastics, and won't break down from the sun's rays, and is perfectly rigid.
